Initial Tests - Ramsey Electronics QRP20 User Manual

46. Install C14, .01 uf (marked .01 or 103 or 10 nf).
47. Install C9, .01 uf (marked .01 or 103 or 10 nf).
48. Install D1, 1N4002 (large black epoxy body), notice placement of
banded end.
49. Install L4, 100 uh inductor [brown-black-brown-silver].
50. Install R8, 47K (yellow-violet-orange).
51. Install C7, .01 uf (marked .01 or 103 or 10 nf).
52. Install C12, 68 pf (marked 68 or 68K).
53. Install Q3, 2N3053. Again observe the placement of the tab.
54. Install the slip-on metal heatsink on Q3. Insure that it does not contact
adjacent components.
The assembly of your QRP transmitter is now completed. If you somehow
skipped or improvised on our "halftime" instructions, NOW is the time to make
proper preparations for testing and using your transmitter.
As we suggest in all Ramsey Electronics kit projects, now might also be an
excellent time to take a break and then come back to re-check your
connections, or have a friend go over them. Give extra attention to the work
associated with Q2 and Q3. It's always easier to catch an error now, before
final testing. Easier on the cicuit parts, and. . . your ego!

INITIAL TESTS:

Connect the following to the transmitter:
•
Key, or keyer such as the Ramsey CW-7 CMOS keyer kit.
•
12-15 VDC power source capable of 500 ma output.
•
Resonant antenna with in-line QRP wattmeter, or 50-ohm 2-watt dummy
load.
For initial testing, your receiver may be connected through J2 of the transmitter
or to a separate receiving antenna.
•
Study the following sections regarding the DC power supply and RF power
indication, and test your transmitter in accord with good amateur radio
practice.
YOUR POWER SUPPLY AND RF OUTPUT POWER :
For optimum performance, one or two volts of extra DC supply power can make
quite a difference for this transmitter. For example, two lantern batteries in
series, or 8 "D cells" obviously provide "about 12 volts" with sufficient current
capability for casual operating. For maximum RF output power, use a supply of
QRP-20 • 17